<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>分歧终端机|在线剪刀石头布</title>
  <link rel="stylesheet" href="css/common.css">
  <link rel="stylesheet" href="css/login.css">
  <script src="js/jquery.min.js"></script>
  <style>
    input::-webkit-input-placeholder {
      color: #cccccc;
      font-size: 14px;
    }

    #canvas {
      vertical-align: middle;
      box-sizing: border-box;
      cursor: pointer;
    }
  </style>
</head>

<body>
<!-- 导航栏 -->
<div class="nav">
  <a href="blog_list.html" class="title">分歧终端机</a>
  <!-- 用来占据中间位置 -->
  <span class="spacer"></span>
  <a href="game_hall.html">游戏大厅</a>
  <a href="reg.html">注册</a>
</div>
<!-- 版心 -->
<div class="login-container">
  <!-- 中间的登陆框 -->
  <div class="login-dialog">
    <h3>登陆</h3>
    <div class="row">
      <span>用户名</span>
      <input type="text" id="username">
    </div>
    <div class="row">
      <span>密码</span>
      <input type="password" id="password">
    </div>
    <div class="row">
                <span>
                    <canvas id="canvas" alt="" style="width: 100px;height: 42px"></canvas>
                </span>
      <input type="text" class="input-val" placeholder="请输入左侧验证码" v-model="yourCode">
      <!--<img th:src="@{/img/code.bmp}" alt=""/>-->
    </div>
    <div class="row" id="regAndlogin">
      <button onclick="location.href='reg.html'">注册</button>
      <button id="submit" onclick="mysub()">登录</button>
    </div>
    <div class="rowfind" id="findpassword">
      <button onclick="location.href='blog_forgetpsw.html'">找回密码</button>
    </div>
  </div>
</div>
<script>
  function mysub() {
    //1.非空校验
    var username = jQuery("#username");
    var password = jQuery("#password");
    if (username.val() == '') {
      alert("用户名不能为空");
      username.focus();
      return;
    }
    if (password.val() == "") {
      alert("密码不能为空");
      password.focus();
      return;
    }
    var val = $(".input-val").val().toLowerCase();
    var num = show_num.join("");
    if (val == '') {
      alert('请输入验证码！');
      return;
    } else if (val == num) {
      // draw(show_num);

    } else {
      alert('验证码错误！请重新输入！');
      $(".input-val").val('');
      return;
      // draw(show_num);
    }
    //2.ajax请求登录结果
    jQuery.ajax({
      type: "post",
      url: "/login",
      data: { "username": username.val(), "password": password.val() },
      success: function (result) {
        if (result != "" && result.code == 200 && result.data != null) {
          //登录成功,重定向到游戏大厅页面
          location.href = "/game_hall.html"
        } else {
          alert("登陆失败！用户名或密码错误！")
        }
      }
    })
  }
  var show_num = [];
  //图形验证码功能:
  $(function () {

    draw(show_num);

    $("#canvas").on('click', function () {
      draw(show_num);
    })

  })

  //生成并渲染出验证码图形
  function draw(show_num) {
    var canvas_width = $('#canvas').width();
    var canvas_height = $('#canvas').height();
    var canvas = document.getElementById("canvas");//获取到canvas的对象，演员
    var context = canvas.getContext("2d");//获取到canvas画图的环境，演员表演的舞台
    canvas.width = canvas_width;
    canvas.height = canvas_height;
    var sCode = "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
    var aCode = sCode.split(",");
    var aLength = aCode.length;//获取到数组的长度

    for (var i = 0; i < 4; i++) {  //这里的for循环可以控制验证码位数（如果想显示6位数，4改成6即可）
      var j = Math.floor(Math.random() * aLength);//获取到随机的索引值
      // var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
      var deg = Math.random() - 0.5; //产生一个随机弧度
      var txt = aCode[j];//得到随机的一个内容
      show_num[i] = txt.toLowerCase();
      var x = 10 + i * 20;//文字在canvas上的x坐标
      var y = 20 + Math.random() * 8;//文字在canvas上的y坐标
      context.font = "bold 23px 微软雅黑";

      context.translate(x, y);
      context.rotate(deg);

      context.fillStyle = randomColor();
      context.fillText(txt, 0, 0);

      context.rotate(-deg);
      context.translate(-x, -y);
    }
    for (var i = 0; i <= 5; i++) { //验证码上显示线条
      context.strokeStyle = randomColor();
      context.beginPath();
      context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
      context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
      context.stroke();
    }
    for (var i = 0; i <= 30; i++) { //验证码上显示小点
      context.strokeStyle = randomColor();
      context.beginPath();
      var x = Math.random() * canvas_width;
      var y = Math.random() * canvas_height;
      context.moveTo(x, y);
      context.lineTo(x + 1, y + 1);
      context.stroke();
    }
  }

  //得到随机的颜色值
  function randomColor() {
    var r = Math.floor(Math.random() * 256);
    var g = Math.floor(Math.random() * 256);
    var b = Math.floor(Math.random() * 256);
    return "rgb(" + r + "," + g + "," + b + ")";
  }

</script>
</body>

</html>